Sorry.... 

What I want is this: To take a height field, which may or may not be
visible, and to create a series of closed loops, each loop sitting on a
specific elevation and encompasing only one "hill" of the hf. Now,
imagine that I apply a gradient y pigment to the hf, it would be
possible to get this effect, except that I want each "countour line" to
be 3-dimensional, like a pipe. 

One could also envision taking a hf and repeatedly intersecting it with
two plane, so you are left with some thin sliced in the shape of a loop.
I want those loops to be pipes. 

I hope this helps.

paul

Christoph Hormann wrote:
> 
> Paul Jones wrote:
> >
> > Anybody have any ideas on how I could make a contour map of a height
> > field?  I tried trace() and dropping a sphere at a point if it had a
> > specific Y value, drop enough spheres and test for different heights and
> > you statrt to get something which is OK, but it take half-past forever.
> > Any other ideas? maybe a sphere sweep of some kind ??
> >
> > -paul
> >
> 
> I'm not totally sure what you want to do, but as i understand it, you want
> that contour lines only in povray.
> 
> How about just using a partly transparent gradient y texture on the HF.
> 
> If that's not a good solution, it would help a lot if you would say what
> you want to use these lines for.
> 
> Christoph
> 
> --
> Christoph Hormann <chr### [at] gmxde>
> IsoWood include, radiosity tutorial, TransSkin and other
> things on: http://www.schunter.etc.tu-bs.de/~chris/

-- 



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Paul Daniel Jones
The Pennslyvania State University

pdj### [at] psuedu
http://research.chem.psu.edu/glassgrp/paul

       C            The way is near, but men
     // \           seek it afar. It is in the
    N    N          easy things, but men seek it
    |    ||         in the difficult things.
    C    C          -Menicius
     \\  /
       C
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